[lehmannro]

shameless plug I have been working on a similar thing in the last few days: http://github.com/lehmannro/commithero

It's based on the commit history rather than local actions and should work on Git, Subversion, Mercurial, and Bazaar. I am still low on achievements (about half a dozen implemented) but tried to make the API for third-party achievements as easy as possible; patches welcome!